我有这段代码,但是我在浏览器上的输出不是我想要的
@GetMapping(path = "/all")
public @ResponseBody List<User> getAllUsers() {
return userRepository.findAll();
}
输出:
[{"id":4,"firstName":"busayo","lastName":"amowe","email":"amoweolubusayo@gmail.com","password":"$2a$10$09kGDhlEp.Xmj0ocDjGLTO.03z.kGQKm2ZHcsNetDpH0r6m1rkVIu","roles":[{"id":1,"name":"ROLE_ADMIN","users":[{"id":4,"firstName":"busayo","lastName":"amowe","email":"amoweolubusayo@gmail.com","password":"$2a$10$09kGDhlEp.Xmj0ocDjGLTO.03z.kGQKm2ZHcsNetDpH0r6m1rkVIu","roles":[{"id":1,"name":"ROLE_ADMIN","users":[{"id":4,"firstName":"busayo","lastName":"amowe","email":"amoweolubusayo@gmail.com","password":"$2a$10$09kGDhlEp.Xmj0ocDjGLTO.03z.kGQKm2ZHcsNetDpH0r6m1rkVIu","roles":[{"id":1,"name":"ROLE_ADMIN","users":[{"id":4,"firstName":"busayo","lastName":"amowe","email":"amoweolubusayo@gmail.com","password":"$2a$10$09kGDhlEp.Xmj0ocDjGLTO.03z.kGQKm2ZHcsNetDpH0r6m1rkVIu","roles":[{"id":1,"name":"ROLE_ADMIN","users":[{"id":4,"firstName":"busayo","lastName":"amowe","email":"amoweolubusayo@gmail.com","password":"$2a$10$09kGDhlEp.Xmj0ocDjGLTO.03z.kGQKm2ZHcsNetDpH0r6m1rkVIu","roles":[{"id":1,"name":"ROLE_ADMIN","users":[{"id":4,"firstName":"busayo","lastName":"amowe","email":"amoweolubusayo@gmail.com","password":"$2a$10$09kGDhlEp.Xmj0ocDjGLTO.03z.kGQKm2ZHcsNetDpH0r6m1rkVIu","roles":[{"id":1,"name":"ROLE_ADMIN","users":[{"id":4,"firstName":"busayo","lastName":"amowe","email":"amoweolubusayo@gmail.com","password":"$2a$10$09kGDhlEp.Xmj0ocDjGLTO.03z.kGQKm2ZHcsNetDpH0r6m1rkVIu","roles":[{"id":1,"name":"ROLE_ADMIN","users":[{"id":4,"firstName":"busayo","lastName":"amowe","email":"amoweolubusayo@gmail.com","password":"$2a$10$09kGDhlEp.Xmj0ocDjGLTO.03z.kGQKm2ZHcsNetDpH0r6m1rkVIu","roles":[{"id":1,"name":"ROLE_ADMIN","users":[{"id":4,"firstName":"busayo","lastName":"amowe","email":"amoweolubusayo@gmail.com","password":"$2a$10$09kGDhlEp.Xmj0ocDjGLTO.03z.kGQKm2ZHcsNetDpH0r6m1rkVIu","roles":[{"id":1,"name":"ROLE_ADMIN","users":[{"id":4,"firstName":"busayo","lastName":"amowe","email":"amoweolubusayo@gmail.com","password":"$2a$10$09kGDhlEp.Xmj0ocDjGLTO.03z.kGQKm2ZHcsNetDpH0r6m1rkVIu","roles":[{"id":1,"name":"ROLE_ADMIN","users":[{"id":4,"firstName":"busayo","lastName":"amowe","email":"amoweolubusayo@gmail.com","password":"$2a$10$09kGDhlEp.Xmj0ocDjGLTO.03z.kGQKm2ZHcsNetDpH0r6m1rkVIu","roles":[{"id":1,"name":"ROLE_ADMIN","users":[{"id":4,"firstName":"busayo","lastName":"amowe","email":"amoweolubusayo@gmail.com","password":"$2a$10$09kGDhlEp.Xmj0ocDjGLTO.03z.kGQKm2ZHcsNetDpH0r6m1rkVIu","roles":[{"id":1,"name":"ROLE_ADMIN","users":[{"id":4,"firstName":"busayo","lastName":"amowe","email":"amoweolubusayo@gmail.com","password":"$2a$10$09kGDhlEp.Xmj0ocDjGLTO.03z.kGQKm2ZHcsNetDpH0r6m1rkVIu","roles":[{"id":1,"name":"ROLE_ADMIN","users":[{"id":4,"firstName":"busayo","lastName":"amowe","email":"amoweolubusayo@gmail.com","password":"$2a$10$09kGDhlEp.Xmj0ocDjGLTO.03z.kGQKm2ZHcsNetDpH0r6m1rkVIu","roles":[{"id":1,"name":"ROLE_ADMIN","users"
不是应该打印一次吗?它说StackOverFlow错误,我的getJson函数无法显示它。我该怎么办?
答案 0 :(得分:1)
您在user
和user role
实体之间具有循环依赖性。
为了将您的回复返回给客户端,您的List<User>
必须被序列化。您必须告诉Jackson如何处理周期,否则它将因堆栈溢出异常而失败。
public class User {
@JsonBackReference
public List<Role> roles;
// ...
}
public class Role {
@JsonManagedReference
public List<User> users;
// ...
}
有关双向关系的Jackson教程,请参见https://www.baeldung.com/jackson-bidirectional-relationships-and-infinite-recursion